The planet has always been changing: current patterns of biodiversity are the result of past environmental conditions and ecological and evolutionary constraints (Benton 2010; Clarke & Crame 2010; Lyons et al. 2010).
What determines the world’s biodiversity?
Habitat change (see: habitat fragmentation or habitat destruction) is the most important driver currently affecting biodiversity, as some 40% of forests and ice-free habitats have been converted to cropland or pasture. Other drivers are: overexploitation, pollution, invasive species, and climate change.
What factors control the current pattern of biodiversity?
Important direct drivers affecting biodiversity are habitat change, climate change, invasive species, overexploitation, and pollution (CF4, C3, C4. 3, S7).
What are the patterns of biodiversity?
Biodiversity patterns occur within species, communities, habitats, regions, ecosystems, biomes and the entire Earth. The within-species diversity is studied as genetic diversity (cf. Sect. 6.1) and refers to the total number of characteristics in the genetic composition of a species.
What is associated biodiversity?
Associated biodiversity is the part of biodiversity that naturally colonizes an agroecosystem thanks to the surrounding environment. … Farming practices on the farm and neighbouring farms determine the quantity of available resources for associated biodiversity (sources of food and habitats).
What is the current status of biodiversity?
Globally, around 1.75 million species have been described and formally named to date, and there are good grounds for believing that several million more species exist but remain undiscovered and undescribed (Table 1.1). Table 1.1 Estimated numbers of described species, and possible global total.
What are the 5 factors that affect biodiversity?
Biodiversity loss is caused by five primary drivers: habitat loss, invasive species, overexploitation (extreme hunting and fishing pressure), pollution, climate change associated with global warming. In each case, human beings and their activities play direct roles.
What factors influence the diversity of species that make up a forest?
The factors related to these patterns of small- scale species richness include (1) geographic factors such as scale of observation, available species pool and dispersal patterns, (2) biotic factors such as competition or predation and (3) abiotic environmental factors such as site resource availability, disturbance and …
What two factors influence the biodiversity of an island?
The number of species found on an island is determined by a balance between two factors: the immigration rate (of species new to the island) from other inhabited areas and the extinction rate (of species established on the island).
What is global pattern of biodiversity?
Biodiversity is the degree of variation of life. … This can refer to genetic variation, species variation, or ecosystem variation within an area, biome, or planet.
What are the global and Indian patterns of biodiversity?
It says that the species richness increases as we go from poles to the tropics. But in deserts , Tropical region is rich in species diversity. For example – Columbia has 1400 bird species where as India has 1200 bird species. Moreover Tropical Forest has greater species diversity than temperate forest.
Does species diversity follow any patterns?
Does species diversity follow any patterns? The diversity of species is lowest at the poles and increases toward the equator, with the deserts being obvious exceptions. … A single hectare is home to 100,000 insect species. 40,000 species of plants can be found in the Amazon basin, and 30,000 of them occur only there.
What is the value of biodiversity in current era?
The role of biodiversity in providing ecosystem services is twofold. Firstly, biodiversity is directly used as a source for food, fibre, fuel and other extractable resources. Secondly, biodiversity plays an important role in ecosystem processes providing the regulating, cultural and supporting services.
How is biodiversity distributed across the earth?
Biodiversity is unevenly distributed across the planet. A range of factors contribute to this distribution, including the global climatic gradient, the current and historical distribution of land masses, and geographical barriers, such as mountains.
What is the origin of biodiversity?
Charles Darwin  identified the first principle of the origin of modern biodiversity, namely that all species were linked in a single great phylogeny, or tree of life, and that all could be traced back to a presumed single original species at some distant time in the geological past.